Star formation towards the Scutum tangent region and the effects of Galactic environment Star formation in the Scutum tangent region
Star formation towards the Scutum tangent region and the effects of Galactic environment Star formation in the Scutum tangent region
复制标题
盾牌切线区域的恒星形成以及银河系环境的影响 盾牌切线区域的恒星形成
DOI：
10.1111/j.1365-2966.2012.20840.x
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发表时间：
2012
影响因子：
4.8
通讯作者：
Eden D
中科院分区：
文献类型：
--
作者：
Eden D
通过与银环巡天分子云目录的位置匹配，我们从银河经度l=28°.5-31°.5和纬度|b|≤1°定义的区域内可能的806个源中推导出了到793个Bolocam星系平面巡天(BGPS)源的距离。这一段银河平面包含了银河结构在不同距离的几个主要特征，主要是英仙座和人马座旋臂的中臂部分以及与银河系长条末端重合的人马座旋臂的切线。通过利用编目的云层距离加上新的运动距离测定，我们能够将密集的BGPS团分成这三个主要的视线分量，以寻找可能与不同的银河系环境有关的恒星形成属性的变化。我们没有发现任何证据表明这些成分之间的团质量函数或平均团形成效率(CFE)存在任何差异，这可能是由于与银河系结构特征相当的尺度上的环境影响。尽管有非常高的恒星形成率，并且至少有一颗云具有非常高的CFE，但与Scutom-Centaurus切线相关的恒星形成似乎并没有以任何方式异常或不同于其他两个旋臂部分。然而，CFE在单个云的尺度上有很大的变化，这可能是由于局部触发因素，而不是大尺度的银河系结构。
By positional matching to the catalogue of Galactic Ring Survey molecular clouds, we have derived distances to 793 Bolocam Galactic Plane Survey (BGPS) sources out of a possible 806 located within the region defined by Galactic longitudesl= 28°.5–31°.5 and latitudes |b|≤ 1°. This section of the Galactic plane contains several major features of Galactic structure at different distances, mainly mid-arm sections of the Perseus and Sagittarius spiral arms and the tangent of the Scutum–Centaurus arm, which is coincident with the end of the Galactic long bar. By utilizing the catalogued cloud distances plus new kinematic distance determinations, we are able to separate the dense BGPS clumps into these three main line-of-sight components to look for variations in star formation properties that might be related to the different Galactic environments. We find no evidence of any difference in either the clump mass function or the average clump formation efficiency (CFE) between these components that might be attributed to environmental effects on scales comparable to Galactic structure features.Despite having a very high star formation rate, and containing at least one cloud with a very high CFE, the star formation associated with the Scutum–Centaurus tangent does not appear to be in any way abnormal or different to that in the other two spiral arm sections. Large variations in the CFE are found on the scale of individual clouds, however, which may be due to local triggering agents as opposed to the large-scale Galactic structure.